In my experience, transcoding with subtitles becomes an issue when the subtitles are burned in to the video. I often get external subtitles from https://www.opensubtitles.org/ and then stick the downloaded SRT file in the same folder as the movie. Make sure it has the exact same file name as the movie so jellyfin will associate the two together. Once I do that, it does not transcode at least for subtitle reasons.
Over 40, been a beer lover for 20 years. Haven't been drunk yet, no plans to. I love beer, but I hate the idea of a hangover. 1 cup of water for every drink, and it hasn't failed me yet.
Lies, damned lies, and statistics